Well-appointed Internet cafes have signs that remind users to log out of any applications before leaving. Not everyone pays attention, including as two robbers at one in Colombia:

It happened in the neighborhood of Calima, north of the city of Cali, Colombia. Two men arrived to an internet cafe, rented two computers, did their thing for a bit and, as they pretended to be paying, they took out guns and got all the money.

One of the two robbers forgot to log out of his Facebook account. Police used it to trace his home address.